Cleanup some classnames to match style.

chrome/browser/resources/net_internals/import_view.html

 <style>
 #import-view-command-line,
 #import-view-user-comments {
   /* Wrap long lines inside of PREs */
   white-space: pre-wrap;
 }
 
 #import-view-load-status-text {
   /* Wrap long lines inside of PREs */
   white-space: pre-wrap;
@@ skipping 16 matching lines @@
   padding: 5px;
   border: 1px solid red;
 }
 
 .import-view-warning-log {
   color: red;
 }
 
 </style>
 
-<div id=import-view-tab-content>
+<div id=import-view-tab-content class=content-box>
 
   <div id=import-view-loaded-div style="display: none">
     <h2>Data Loaded</h2>
-    <table class=styledTable>
+    <table class=styled-table>
     <tr>
       <th>Export date</th>
       <td id=import-view-export-date></td>
     </tr>
     <tr>
       <th>Build</th>
       <td id=import-view-build-name></td>
     </tr>
     <tr>
       <th>OS type</th>
@@ skipping 11 matching lines @@
   </div>
   <div>
     <h2>Load data</h2>
     <p><input type=file value="Load log from file" id=import-view-load-log-file /></p>
     <ul>
       <li><b>TIP</b>: Try drag-and-drop into this window!</li>
     </ul>
     <pre id=import-view-load-status-text></pre>
   </div>
 </div>